package redis

import (
	"context"
	"crypto/tls"
	"net"
	"time"

	"github.com/go-redis/redis/v8"
)

// Config defines the config for redis storage.
type Config struct {
	// Custom options

	// https://pkg.go.dev/github.com/go-redis/redis/v8#Options

	// The network type, either tcp or unix.
	// Default is tcp.
	Network string
	// host:port address.
	Addr string

	// Dialer creates new network connection and has priority over
	// Network and Addr options.
	Dialer func(ctx context.Context, network, addr string) (net.Conn, error)

	// Hook that is called when new connection is established.
	OnConnect func(ctx context.Context, cn *redis.Conn) error

	// Use the specified Username to authenticate the current connection
	// with one of the connections defined in the ACL list when connecting
	// to a Redis 6.0 instance, or greater, that is using the Redis ACL system.
	Username string
	// Optional password. Must match the password specified in the
	// requirepass server configuration option (if connecting to a Redis 5.0 instance, or lower),
	// or the User Password when connecting to a Redis 6.0 instance, or greater,
	// that is using the Redis ACL system.
	Password string

	// Database to be selected after connecting to the server.
	DB int

	// Maximum number of retries before giving up.
	// Default is 3 retries.
	MaxRetries int

	// Minimum backoff between each retry.
	// Default is 8 milliseconds; -1 disables backoff.
	MinRetryBackoff time.Duration

	// Maximum backoff between each retry.
	// Default is 512 milliseconds; -1 disables backoff.
	MaxRetryBackoff time.Duration

	// Dial timeout for establishing new connections.
	// Default is 5 seconds.
	DialTimeout time.Duration

	// Timeout for socket reads. If reached, commands will fail
	// with a timeout instead of blocking. Use value -1 for no timeout and 0 for default.
	// Default is 3 seconds.
	ReadTimeout time.Duration

	// Timeout for socket writes. If reached, commands will fail
	// with a timeout instead of blocking.
	// Default is ReadTimeout.
	WriteTimeout time.Duration

	// Maximum number of socket connections.
	// Default is 10 connections per every CPU as reported by runtime.NumCPU.
	PoolSize int

	// Minimum number of idle connections which is useful when establishing
	// new connection is slow.
	MinIdleConns int

	// Connection age at which client retires (closes) the connection.
	// Default is to not close aged connections.
	MaxConnAge time.Duration

	// Amount of time client waits for connection if all connections
	// are busy before returning an error.
	// Default is ReadTimeout + 1 second.
	PoolTimeout time.Duration

	// Amount of time after which client closes idle connections.
	// Should be less than server's timeout.
	// Default is 5 minutes. -1 disables idle timeout check.
	IdleTimeout time.Duration

	// Frequency of idle checks made by idle connections reaper.
	// Default is 1 minute. -1 disables idle connections reaper,
	// but idle connections are still discarded by the client
	// if IdleTimeout is set.
	IdleCheckFrequency time.Duration

	// TLS Config to use. When set TLS will be negotiated.
	TLSConfig *tls.Config

	// Limiter interface used to implemented circuit breaker or rate limiter.
	Limiter redis.Limiter
}

// ConfigDefault is the default config
var ConfigDefault = Config{
	Addr: "127.0.0.1:6379",
}

// Helper function to set default values
func configDefault(cfg Config) Config {
	if cfg.Addr == "" {
		cfg.Addr = ConfigDefault.Addr
	}
	return cfg
}